In this Skillpill, you will learn how to create a Parliament Chart in Tableau.
A Parliament Chart, or semicircular chart, represents the distribution of parliamentary seats. It is not a standard chart type in Tableau but can be manually created using calculations and customizations.
This type of chart is ideal for visualizing proportional distributions, such as parliamentary seats, votes, or other categories, in a way that is engaging and appealing.
→ Start by preparing your data and ensure it’s in a format that includes, in this case: the party and the number of seats occupied by each
Next, create several calculated fields that will help correctly display the data, i.e., the members on the semicircular parliament layout:
→ Calculated field INDEX with the formula: INDEX() - 1
→ Calculated field Total (total number of members) with the formula: {FIXED : COUNTD([Seat #])}
→ Calculated field Item with the formula: INT(INDEX / Rows)
→ Calculated field Steps, which account for the half-circle representation, with the formula: 180 / (MAX(Total) / Rows - 1)
→ Calculated field Distance with the formula: (INDEX % Rows) + Rows from Center
→ Calculate the X and Y coordinates using the following formulas:
X Coordinate: COS(RADIANS(Item) * Steps) * Distance Y Coordinate: SIN(RADIANS(Item) * Steps) * Distance
Here, you can view the result in Tableau Public:
Watch the video tutorial here:
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